tests: Count queries for /json/users.
tests: Count queries for /json/users.

I am trying to optimize a query in this endpoint.
I don't think I'll actually reduce the number of
queries, but I wanted to capture the query and
this was the easiest way to do it, so might as
well check in the code! :)

showell/zulip,synicalsyntax/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,showell/zulip,timabbott/zulip,shubhamdhama/zulip,kou/zulip,showell/zulip,andersk/zulip,rht/zulip,punchagan/zulip,andersk/zulip,showell/zulip,shubhamdhama/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,zulip/zulip,showell/zulip,synicalsyntax/zulip,timabbott/zulip,hackerkid/zulip,andersk/zulip,shubhamdhama/zulip,punchagan/zulip,timabbott/zulip,timabbott/zulip,punchagan/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,brainwane/zulip,zulip/zulip,shubhamdhama/zulip,rht/zulip,synicalsyntax/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,punchagan/zulip,zulip/zulip,kou/zulip,synicalsyntax/zulip,synicalsyntax/zulip,hackerkid/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,showell/zulip,hackerkid/zulip,shubhamdhama/zulip,timabbott/zulip,brainwane/zulip,kou/zulip,rht/zulip,synicalsyntax/zulip,kou/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,rht/zulip,brainwane/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,punchagan/zulip,shubhamdhama/zulip,brainwane/zulip,brainwane/zulip,rht/zulip,timabbott/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,timabbott/zulip,shubhamdhama/zulip